travis: don't instal cmake
travis: don't instal cmake

We don't depend on it anymore.

tsuru/tsuru,hugoantunes/tsuru,gciotta/tsuru,mderaldo/tsuru,hcxiong/tsuru,tsuru/tsuru,gwmoura/tsuru,guilhermebr/tsuru,Endika/tsuru,kgrvamsi/tsuru,4eek/tsuru,guilhermebr/tsuru,cezarsa/tsuru,tsuru/tsuru,ggarnier/tsuru,cezarsa/tsuru,cezarsa/tsuru,gwmoura/tsuru,kgrvamsi/tsuru,gwmoura/tsuru,jblancett/tsuru,firebitsbr/tsuru,tsuru/tsuru,tuxmonteiro/tsuru,4eek/tsuru,kgrvamsi/tsuru,jblancett/tsuru,RichardKnop/tsuru,guilhermebr/tsuru,cgvarela/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,ggarnier/tsuru,RichardKnop/tsuru,ArxdSilva/tsuru,Endika/tsuru,Endika/tsuru,hcxiong/tsuru,tuxmonteiro/tsuru,cezarsa/tsuru,hugoantunes/tsuru,mderaldo/tsuru,mderaldo/tsuru,cgvarela/tsuru,RichardKnop/tsuru,jblancett/tsuru,4eek/tsuru,ggarnier/tsuru,firebitsbr/tsuru,gciotta/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,hcxiong/tsuru,tuxmonteiro/tsuru,cgvarela/tsuru,firebitsbr/tsuru,gciotta/tsuru,ArxdSilva/tsuru